Water heater T&P relief valve drain line termination, at a point where discharge is observable, but where discharge will not cause personal injury or structural damage (terminate max. 6 inches above surface below), City amended section P2803.6.1, I.R.C. ***Please note: If a pressure-reducing valve, backflow prevention device or check valve is installed, a thermal expansion control device shall be installed in accordance with section P2903.4, I.R.C.